Food Web Unit Test

What would MOST LIKELY happen to producers if most of the decomposers die?

• The soil will become richer.
• The producers will not grow as well.

• The producers will grow more quickly

• New producers will replace the other producers.

Over the years, the forest cover in a particular ecosystem was reduced from about 50% to 20%. What would be the MOST LIKELY effect of this?

• The loss of moisture from the soil would be reduced.
• Herbivores would be forced to change into carnivores
• The flow of energy in the ecosystem would be affected.
• The exchange of carbon dioxide in the ecosystem would increase

What role do predators play in maintaining the balance of an ecosystem?

• They ensure that the ecosystem is not stripped entirely of its vegetation
• They ensure that energy cannot be transferred to the rest of the food web.
• They are primarily responsible for the transfer of nutrients to the plants.
• They are primarily responsible for the cross pollination of plants in the ecosystem.

An aquatic ecosystem was rich in benthic microalgae and sea grasses. Over the years, industrial pollutants have reduced these populations considerably. How would this affect the ecosystem?

• There would be no energy produced in the system
• There would be more energy available in the ecosystem
• It will increase the number of organisms at higher trophic levels
• There would be less energy transferred to the higher trophic levels

What is the MOST LIKELY effect on the energy pyramid if all producers are removed from the ecosystem?

• The energy pyramid will not change.
• The energy pyramid will become inverted.
• The energy pyramid will be completely disturbed.
• The energy pyramid will begin with primary consumers.

What is NOT an impact that an invasive non-native species has on an ecosystem?

• change food webs change food webs
• decrease biodiversity
• prey on native species
• improves forest productivity and overall health

If a predator population increases, what would we expect to happen to a 2nd predator population in the same area?

• The 2nd predator population would remain high.

• The 2nd predator population would drop below its current level.

• Both predator populations populations would balance decrease

• The 2nd predator population would decrease and eventually reach zero

Where does the seaweed and the phytoplankton get their energy from?

• The fish
• The moon
• The sun
• The ocean

Which of the following is a primary consumer?

• Krill

• Fish

• Squid

• Phytoplankton

If the krill population were to disappear the animal MOST affected in this food web would be

• The elephant seal
• The blue whale

• The seagull
• The penguin